MILK THISTLE—THE MOST WIDELY USED HERB FOR HEPATITIS/LIVER DISEASE
Milk thistle (also known as silymarin and its scientific name Silybum marianum) is a tall plant, characterized by sharp spines that resemble artichokes and leaves that are riddled with distinctive white veins. It was originally discovered growing in the Kashmir region bordering India and Pakistan. It can now be found all over the temperate world, growing in dry and rocky soil. Its stems and leaves secrete a milky substance when crushed. The following sections contain important information regarding this popular herb. It is important to be aware that some preparations of milk thistle may contain iron therefore milk thistle should be avoided by people with liver diseases associated with iron overload such as hemochromatosis and some cases of chronic hepatitis C.
The History of Milk Thistle
As with so many other herbs, the medicinal claims for milk thistle have an ancient history. Originally believed to help nursing mothers produce milk, over time milk thistle became more well known for its effects on the liver. This can be traced back to ancient Roman times when Pliny the Elder (a.d. 23–79) referred to the milky juice of this plant as being excellent for “carrying off bile.” John Gerard, a sixteenth century British herbalist, recommended milk thistle for “expelling melancholy”, a symptom attributed to liver disease during that era. In Germany during the nineteenth century, doctors commonly treated jaundice and other liver diseases with an extract from milk thistle seeds. The scientific study of herbs continued to be concentrated in Europe, and in 1949, German researchers found that milk thistle appeared to protect the livers of animals exposed to high doses of carbon tetrachloride, a potent liver toxin.
In 1968, it was found that the active ingredient in milk thistle is located in the seed, and that it consists of three components silybin, silydianin, and silychristin. These components are now collectively referred to as the flavonoid silymarin. Silymarin is currently used in Europe to treat all types of liver disorders. In the United States due to the lack of FDA regulation, the actual percentage of biologically active silymarin in a given preparation of milk thistle is unknown.
The Benefits Claimed for Milk Thistle
The following claims have been made about milk thistle:
• Milk thistle may reverse liver damage in alcoholics.
• Milk thistle may reverse liver injury in patients with chronic hepatitis.
• Milk thistle may slow the advancement of cirrhosis.
• Milk thistle may improve the long-term survival rate among cirrhotic patients.
Herbalists claim that milk thistle achieves the above in three different ways: First, milk thistle is said to strengthen the outer protective membrane of liver cells so that they are better at deflecting toxins. Second, milk thistle is said to shield the liver from free radicals, which are potentially dangerous, yet inevitable byproducts of some of the body’s basic metabolic functions. And finally, milk thistle is said to stimulate the production of new liver cells to replace old damaged ones. This section will examine some of the evidence that forms the basis for each of these alleged properties of milk thistle.
Summary of What Milk Thistle May Do
From the above evidence it appears that milk thistle is very helpful in cases of acute mushroom poisoning. It may be helpful for people with alcoholic liver disease or liver disease caused by certain drugs. However, milk thistle does not appear to have any anti-viral properties. Thus, although it may decrease liver enzyme elevations it cannot eradicate the hepatitis C or B viruses from the body, nor can it lessen the amount, or toxicity of these viruses in the body.
The Most Effective Way to Take Milk Thistle
So, if a person decides that she wants to try milk thistle, how should she take it in order to maximize its proclaimed effects on the liver? Well, since milk thistle does not easily dissolve in water, its purported benefits cannot be reaped by drinking it as a tea or by eating the leaves. The best way to take milk thistle is either in capsule form, especially from concentrate, or in a form that combines it with other substances—such as beta-cyclodextrin or phosphatidylcholine (silipide)—that render milk thistle more soluble in water. In this way, milk thistle becomes more bioavailable to the body, and its effects are maximized. The concentration of silymarin is highest in the seeds of the plant, although it is also found in the fruit and leaves.
With milk thistle, as with all herbal remedies, there is no standard recommended dose or length of time to take the herb in order to best achieve its purported benefits. Recommendations made on labels and in herbal publications vary—from as low as 70 milligrams twice per day to as high as 420 milligrams three times per day. Recommendations for duration of use range from one month to as long as nine months. There are no standard recommendations as to the best time of day to take the herb or whether to take it with food as opposed to on an empty stomach. The PDR for Herbal Medicines recommends 200 to 400 milligrams of silymarin daily, but contains no additional recommendations regarding its use.
The Side Effects of Milk Thistle
Most reports on milk thistle claim that there is a total lack of side effects when taking this herb. However, on close review of the literature, the following side effects were noted: headache, irritability, nausea, minor gastrointestinal upset, and, most commonly, diarrhea. These side effects are similar to those commonly encountered in connection with the use of interferon (the FDA-approved treatment for hepatitis B and C). One experimental study, which has not been duplicated, demonstrated that liver cell damage occurred as a result of exposing liver cells to milk thistle. The long-term side effects of milk thistle usage are not known.
All contents of this article are Copyright © Melissa Palmer, MD
Melissa Palmer, MD is the author of " Dr. Melissa Palmer's Guide of Hepatitis and Liver Disease". (Published 2004. Penguin Putnam).
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